fix: crash of closeEvent in racewindow and settingsmenu + code cleanup

evaluation.h

@@ -5,6 +5,7 @@
 #include "result.h"
 #include <QListWidgetItem>
 #include <QWidget>
+#include <memory>
 #include <qstring.h>
 #include <vector>
 
@@ -18,13 +19,14 @@ class Evaluation : public QWidget {
     Q_OBJECT
 
   public:
-    explicit Evaluation(DataBase * db, QWidget * parent = nullptr);
+    explicit Evaluation(std::shared_ptr<DataBase> db,
+                        QWidget * parent = nullptr);
     ~Evaluation();
 
   private:
     Ui::Evaluation * ui;
-    Result * interfaceResult;
-    DataBase * db;
+    std::shared_ptr<Result> interfaceResult;
+    std::shared_ptr<DataBase> db;
     vector<vector<QString>> result;
 
   public slots: